Administratrix of the



JOSEPHINE s'rnwinuor owossnnfMICHIGAN,ADMINISTRATRIX or THE ESTATE OF yR. L. STEWART, DECEASED.' l

Leiters l-iatent Nro. 63,114, datedrlfarchli), 1867.

IMPBVEMBNT n1 SAW-MILLS.

To ALL wHoM IT'MAY coNoERN:

Be itl'inown that R. L. STEWART, deceased, late of Owossee,Shiawasseeicounty, Michigan, did, during hisv lifetime, invent a new anduseful Improvement inv Hanging Reciprocating Saws, and I, JOSEPHINESTEWART, -of` Owessce, as aforesaid, vadministratri;` of the estate ofsaid R. L. STEWART, deceased, do hereby declare that the following is afull,'clear,.and exact description thereof, which will enablethoseskilled in the art to make and use the same, reference bein-g hadto the accompanying drawings, forming part of this specification.

This invention' is' dcsignedto be an. improvement upon the method ofhanging saws, Letters Patent for which were granted te R. L. STEWART',February 9, 1854.',

The improvement consists in so arranging the different portions of themachine that the saw may be forced baclid'uriug its upward stroke toavoid unnecessary friction and to permit the escape of thesaw-dnst. Whenit descends the saw is dra'wnforward against the timber `to be sawn. Acombined vertical and horizontal motion is thus imparted to the saw.' Inthe accompanying drawings this invention is illustrated- Figure l beinga verticallongitudinal sectional view, the plane of section` beingindicated by the lin m x, fig. 2.

Figure 2 is ahorizontalsectional view, thel plane ofscctionbeingindicatcd by the line yy, fig; 1 i

Figure 3 is a'detail sectional frontview, showing,r the mannerof'hanging the saw, the plane of section being indicated bythe line z e,iig. 1.'

`Similar letters'lof reference indicate corresponding parts.

'The crank-whcelAis attached to Vthc driving-shaft Bwhich has itsbearings in a frame, C, andis revolved in the usual manner. The frame Cis made of wood or any other suitable material strong enough to' supportand hold the working parts of the machine. To the crank-wheel A ispivoted the `vertical pitm'an D, the upper end of which is pivotcdtolthe lower end of the saw E by lmeans of a' pivot, a, 'which passesthrough the saw and through the branched ends b of lthe pitman D. Thesebranched arms extend 4a little above the pivot a, and to them arepivoted by apin, c,-'the branched arms of theilrorizontal'pitman F, asshown in the drawings. The other end of the pitmanF is pivoted to thelower end of the short vertical rod d, the upper end of which ispivotedte the frame C, as shown. To `the centre, or nearly so, of thehorizontal pitrnan F are pivoted, by a pin, c, the side arms Gr, as seenmore particularly in lig.` 42. -."lhe other ends of these side arms arepivoted to the frame C by pinsf. H are the lateral guides lto thesaw,vwh'creby the latterv is prevented from side motion during itsup-and-down strokes. By this construction the horizontal' pitman F tendsto revolve about the ypoint c, as the saw moves upward; the saw isthereby forced baekin the cut, thereby relieving it from the friction onthe logl and allowingthe saw-dust to fall freely. -A's the saw descendsit isrdrawn forward again against the timber to be sawn. The short arm dallows the horizontal movement to the Pitman F. By this arrangement the'machine is made simpler `and less expensive lthan before, and'it doesits work in a more effective manner.

Having thus described this invention, what is claimed as new, anddesired to secureby Letters Patent, is-

The pitman F, pivoted at its-centre to thel pivoted' arms Gr, at itsouter end to the arm d, and at its inner end to the pitman D,constructed and'operating substantially as described for the purposespecified.

JOSEPHINE STEWART,

Administrativa of the Estate of R. L. Stewart, deceased.

Witnesses-2 'IRA Menem, Louisa MnnsLL'.;

